package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.fasterxml.jackson.annotation.JsonBackReference;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    private  static  final String wxLogin_Url="https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
//      获得openid
        String openid = getOpenid(userLoginDTO.getCode());
//      openid是否为空
        if(openid==null) {
            throw  new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
//      判断是不是新用户
        User user = userMapper.findByid(openid);
        if(user==null) {
          user= User.builder()
                     .createTime(LocalDateTime.now())
                     .openid(openid).build();
            userMapper.insert(user);
        }
        return user;
    }


    /**
     * 调用微信接口服务获得 用户的openid
     * @param code
     * @return
     */
    private String getOpenid(String code) {
        Map map=new HashMap();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String s = HttpClientUtil.doGet(wxLogin_Url,map);
        JSONObject jsonObject = JSON.parseObject(s);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
